Colorado Area Codes
303, 720, 970 & 719
Reaching Denver, Aspen, or Colorado Springs should not cost a fortune. Pay only for the minutes you use and ring any Colorado number, from a Tech Center office to a Rockies resort, in clear HD straight from your browser.
Dialing Colorado in Three Simple Steps
Colorado numbers sit inside the standard North American Numbering Plan (NANP), so the format never changes.
Exit Code
Enter 00 if you are in Europe, otherwise use whatever exit code your country requires.
(Or simply tap + on mobile or VoIP)
US Country Code
Add 1, the shared country code for the United States, Canada, and several Caribbean nations.
Area Code + Number
Type the 3-digit Colorado area code, for example 303, and then the 7-digit local number.
Mandatory 10-Digit Dialing
Several Colorado regions share "overlay" area codes, with 303 and 720 both serving Denver. Because of that you always need the full 10 digits (the area code plus the phone number), even when the call stays inside the same city.
Which Code Covers Each Colorado City
Match your destination across the Centennial State to its correct area code below.
| City | Region | Code |
|---|---|---|
| Denver | Central / Metro | 303 / 720 |
| Colorado Springs | Southeast / Pikes Peak | 719 |
| Aurora | Denver Metro | 303 / 720 |
| Fort Collins | Northern Colorado | 970 |
| Boulder | Front Range | 303 / 720 |
| City | Region | Code |
|---|---|---|
| Aspen / Vail | Mountain Towns | 970 |
| Pueblo | Southern Colorado | 719 |
| Grand Junction | Western Slope | 970 |
| Durango | Southwest | 970 |
| Greeley | Northern Plains | 970 |
The Cheaper Way to
Call Colorado
Ringing US numbers through a traditional carrier from overseas can run upwards of $0.034 per minute. Intercalling routes the same call over the internet for a small fraction of that, and the audio stays crystal clear.
- Competitive per minute rates to the USA
- One flat price for landlines and mobiles alike
- No roaming charges and no contracts
- Built for business trips and everyday travel
Statewide
Connect to any line in Denver, the Springs, or the far reaches of the Rockies.
No Roaming
Skip the costly surcharges international carriers tack on.
Secure
Every call is encrypted, so your conversations stay private.
Instant
Nothing to download. Open your browser, dial, and talk.
Frequently Asked Questions
How do 303 and 720 differ?
303 came first and serves Denver and the wider metro. 720 was layered on top later as an 'overlay' code. The two share identical territory, and calls between them count as local, yet they still demand 10-digit dialing.
What is the way to dial a 970 number?
Enter +1, then 970, then the 7-digit number. That code reaches Northern Colorado (Fort Collins), Western Colorado (Grand Junction), and the mountain resort towns (Aspen, Vail).
What is the current time in Colorado?
The state observes Mountain Time (MST/MDT). That usually puts it 2 hours behind New York (EST) and 1 hour ahead of California (PST).
How cheap are calls to Colorado mobiles?
Intercalling keeps US mobile rates very low on a pay as you go basis. They are not free, but they come in far below the cost of a standard international calling plan.
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